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HMC424LP3 / 424LP3E
Attenuators - DIGITAL - SMT
v08.0809
0.5dB LSB GaAs MMIC 6-BIT DIGITAL
ATTENUATOR, DC - 13 GHz
Typical Applications
Features
The HMC424LP3 / HMC424LP3E is ideal for:
0.5 dB LSB Steps to 31.5 dB
• Basestation Infrastructure
Single Control Line Per Bit
• Fiber Optics & Broadband Telecom
± 0.5 dB Typical Bit Error
• Microwave & VSAT Radios
9mm2 Leadless SMT Plastic Package
• Military & Space
• Test Instrumentation
Functional Diagram
General Description
The HMC424LP3 & HMC424LP3E are broadband
6-bit GaAs IC digital attenuators in low cost leadless
surface mount packages. Covering DC to 13 GHz, the
insertion loss is less then 4 dB typical. The attenuator
bit values are 0.5 (LSB), 1, 2, 4, 8, and 16 dB for a
total attenuation of 31.5 dB. Attenuation accuracy is
excellent at ± 0.5 dB typical step error with an IIP3 of
+32 dBm. Six control voltage inputs, toggled between
0 and -5V, are used to select each attenuation state.
A single Vee bias of -5V allows operation at frequencies down to DC.
Electrical Specifications, TA = +25° C, With Vee = -5V & VCTL= 0/-5V
Parameter
Frequency (GHz)
Typ.
Max.
Units
Insertion Loss
DC - 4 GHz
4.0 - 8.0 GHz
8.0 - 13.0 GHz
Min.
3.1
3.5
4.0
3.8
4.0
4.6
dB
dB
dB
Attenuation Range
DC - 13.0 GHz
31.5
dB
Return Loss (RF1 & RF2, All Atten. States)
DC - 13.0 GHz
12
dB
DC - 13.0 GHz
DC - 13.0 GHz
± (0.3 + 3% of Atten. Setting) Max
± (0.3 + 5% of Atten. Setting) Max
dB
dB
1.0 - 13.0 Ghz
22
dBm
1.0 - 13.0 Ghz
46
32
dBm
dBm
30
50
ns
ns
9
Attenuation Accuracy: (Referenced to Insertion Loss)
0.5 - 15.5 dB States
16 - 31.5 dB States
Input Power for 0.1 dB Compression
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON/tOFF (50% CTL to 10/90% RF)
1
REF State
All Other States
DC - 13.0 GHz
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC424LP3E
v08.0809
0.5dB LSB GaAs MMIC 6-BIT DIGITAL
ATTENUATOR, DC - 13 GHz
Return Loss RF1, RF2
0
0
-2
-5
-4
+25 C
+85 C
-40 C
-6
-8
0.5 dB
1 dB
2 dB
4 dB
-10
-15
-20
-10
-25
0
3
6
9
12
15
0
3
6
FREQUENCY (GHz)
12
15
Bit Error vs. Attenuation State
(Only Major States are Shown)
0
2
-5
0.1 GHz
4 GHz
8 GHz
13 GHz
1
-10
BIT ERROR (dB)
NORMALIZED ATTENUATION (dB)
9
FREQUENCY (GHz)
Normalized Attenuation
-15
-20
0.5 dB
1 dB
2 dB
4 dB
-25
8 dB
16 dB
31.5 dB
0
-1
-30
-35
-2
0
3
6
9
12
15
0
4
8
12
16
20
24
28
32
ATTENUATION STATE (dB)
FREQUENCY (GHz)
Bit Error vs. Frequency
Relative Phase vs. Frequency
(Only Major States are Shown)
(Only Major States are Shown)
2
100
8 dB
16 dB
31.5 dB
0.5 dB
1 dB
2 dB
4 dB
80
RELATIVE PHASE (deg)
0.5 dB
1 dB
2 dB
4 dB
1
BIT ERROR (dB)
8 dB
16 dB
31.5 dB
Attenuators - DIGITAL - SMT
(Only Major States are Shown)
RETURN LOSS (dB)
INSERTION LOSS (dB)
Insertion Loss
0
-1
-2
8 dB
16 dB
31.5 dB
60
40
20
0
-20
0
3
6
9
FREQUENCY (GHz)
12
15
0
3
6
9
12
15
FREQUENCY (GHz)
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
2
HMC424LP3E
v08.0809
0.5dB LSB GaAs MMIC 6-BIT DIGITAL
ATTENUATOR, DC - 13 GHz
Worst Case Step Error
Between Successive Attenuation States
Bias Voltage & Current
Vee Range= -5 Vdc ± 10%
1
STEP ERROR (dB)
Attenuators - DIGITAL - SMT
2
Vee
(VDC)
Iee (Typ.)
(mA)
Iee (Max.)
(mA)
-5
2
5
0
Control Voltage
-1
-2
0
3
6
9
12
15
State
Bias Condition
Low
0 to -3V @ 35 µA Typ.
High
Vee to Vee +0.8V @ 5 µA Typ.
FREQUENCY (GHz)
Truth Table
Control Voltage Input
Attenuation
State
RF1 - RF2
V1
16 dB
V2
8 dB
V3
4 dB
V4
2 dB
V5
1 dB
V6
0.5 dB
Low
Low
Low
Low
Low
Low
Reference
I.L.
Low
Low
Low
Low
Low
High
0.5 dB
Low
Low
Low
Low
High
Low
1 dB
Low
Low
Low
High
Low
Low
2 dB
Low
Low
High
Low
Low
Low
4 dB
Low
High
Low
Low
Low
Low
8 dB
High
Low
Low
Low
Low
Low
16 dB
High
High
High
High
High
High
31.5 dB
Any Combination of the above states will provide
an attenuation approximately equal to the sum of
the bits selected.
3
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC424LP3E
v08.0809
0.5dB LSB GaAs MMIC 6-BIT DIGITAL
ATTENUATOR, DC - 13 GHz
Control Voltage (V1 to V6)
Vee - 0.5 Vdc
Bias Voltage (Vee)
-7 Vdc
Channel Temperature
150 °C
Thermal Resistance
330 °C/W
Storage Temperature
-65 to + 150 °C
Operating Temperature
-55 to +85 °C
RF Input Power (0.5 - 13 GHz)
+25 dBm
Attenuators - DIGITAL - SMT
Absolute Maximum Ratings
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS]
3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
4. PAD BURR LENGTH SHALL BE 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE
SOLDERED TO PCB RF GROUND.
7. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED
LAND PATTERN.
Package Information
Part Number
Package Body Material
Lead Finish
MSL Rating
HMC424LP3
Low Stress Injection Molded Plastic
Sn/Pb Solder
MSL1
[1]
HMC424LP3E
RoHS-compliant Low Stress Injection Molded Plastic
100% matte Sn
MSL1
[2]
Package Marking [3]
424
XXXX
424
XXXX
[1] Max peak reflow temperature of 235 °C
[2] Max peak reflow temperature of 260 °C
[3] 4-Digit lot number XXXX
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
4
HMC424LP3E
v08.0809
0.5dB LSB GaAs MMIC 6-BIT DIGITAL
ATTENUATOR, DC - 13 GHz
Attenuators - DIGITAL - SMT
Pin Description
Pad Number
Function
Description
1, 3, 10, 12
GND
Package bottom has an exposed metal paddle that
must also be connected to RF ground
2, 11
RFIN, RFOUT
This pin is DC coupled and matched to 50 Ohm. Blocking
capacitors are required if RF line potential is not equal to 0V.
4, 5, 6, 7, 8, 9
V6 - V1
See truth table and control voltage table.
13, 14, 16
N/C
This pin should be connected to PCB RF
ground to maximize performance
15
VEE
Supply Voltage -5V ± 10%
Interface Schematic
Suggested Driver Circuit (One Circuit Required Per Bit Control Input)
Simple driver using inexpensive standard logic ICs provides fast
switching using minimum DC current.
* Recommended value to suppress unwanted RF signals at V1 V6 control lines.
5
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC424LP3E
v08.0809
0.5dB LSB GaAs MMIC 6-BIT DIGITAL
ATTENUATOR, DC - 13 GHz
* R1 - R6 = 100 Ohm.
These resistors are optional
and may be used to enhance
decoupling of the RF path
from the control inputs.
Attenuators - DIGITAL - SMT
Evaluation PCB
List of Materials for Evaluation PCB 105406 [1]
Item
Description
J1 - J2
PCB Mount SMA Connector
J3
8 Pin DC Connector
C1
0.01 µF Capacitor, 0603 Pkg.
R1 - R6
100 Ohm Resistor, 0603 Pkg.
U1
HMC424LP3 / HMC424LP3E Digital Attenuator
PCB [2]
105245 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
The circuit board used in the application should use
RF circuit design techniques. Signal lines should
have 50 Ohm impedance while the package ground
leads and exposed paddle should be connected
directly to the ground plane similar to that shown.
A sufficient number of via holes should be used to
connect the top and bottom ground planes. The evaluation circuit board shown is available from Hittite
upon request.
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
6